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API API-571 Exam Syllabus Topics:

SectionObjectives
Topic 1: Damage Mechanisms- Environment-Assisted Cracking
  • 1. Hydrogen-Induced Cracking (HIC) / Stepwise Cracking
  • 2. Ethanol Stress Corrosion Cracking (SCC)
  • 3. Caustic Stress Corrosion Cracking
  • 4. Chloride Stress Corrosion Cracking (Cl-SCC)
  • 5. Ammonia Stress Corrosion Cracking
  • 6. Carbonate Stress Corrosion Cracking
  • 7. Polythionic Acid Stress Corrosion Cracking (PTA-SCC)
  • 8. Amine Stress Corrosion Cracking
  • 9. Hydrogen Embrittlement
  • 10. Sulfide Stress Cracking (SSC) / Hydrogen Stress Cracking
  • 11. Stress-Oriented Hydrogen-Induced Cracking (SOHIC)
- High-Temperature Hydrogen Attack (HTHA)
  • 1. Decarburization
  • 2. Internal Hydrogen Attack (IHA)
- High Temperature Corrosion (800°F / 425°C and above)
  • 1. Nitriding
  • 2. Metal Dusting
  • 3. Fuel Ash Corrosion
  • 4. Sulfidation
  • 5. Carburization
  • 6. Oxidation
- General / Mechanical
  • 1. Dissimilar Metal Weld (DMW) Cracking
  • 2. Fretting / Fretting Corrosion
  • 3. Hydrogen Embrittlement
  • 4. Thermal Fatigue
  • 5. Metal Dusting
  • 6. Fatigue
  • 7. Brittle Fracture
  • 8. Stress Relief Cracking
  • 9. Graphitization
  • 10. Temper Embrittlement
  • 11. Cavitation
  • 12. Sigma Phase Embrittlement
  • 13. Corrosion Under Insulation (CUI)
  • 14. Zinc Embrittlement
  • 15. Galvanic Corrosion
  • 16. Softening (Spheroidization)
  • 17. 885°F (475°C) Embrittlement
  • 18. Atmospheric Corrosion
  • 19. Creep / Stress Rupture
  • 20. Mechanical Fatigue
  • 21. Strain Aging
  • 22. Vibration-Induced Fatigue
  • 23. Erosion/Erosion-Corrosion
  • 24. Liquid Metal Embrittlement (LME)
- Uniform or Localized Loss of Thickness
  • 1. Cooling Water Corrosion
  • 2. Soil Corrosion
  • 3. Caustic Corrosion
  • 4. Flue Gas Dew Point Corrosion
  • 5. Microbiologically Influenced Corrosion (MIC)
  • 6. Boiler Water / Condensate Corrosion
  • 7. CO2 Corrosion
  • 8. Corrosion Under Insulation (CUI)
  • 9. Flow-Accelerated Corrosion (FAC) / Flow-Assisted Corrosion
  • 10. Galvanic Corrosion
  • 11. Atmospheric Corrosion
  • 12. Dealloying (Selective Leaching)

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API Corrosion and Materials Professional Sample Questions (Q53-Q58):

NEW QUESTION # 53
Amine cracking has been reported down to ambient temperatures with some amines. __________ temperatures and stress levels _______ the likelihood and severity of cracking.

Answer: A


NEW QUESTION # 54
___________ is when oxygen reacts with carbon steel and other alloys at high temperatures converting the metal to oxide scale.

Answer: D


NEW QUESTION # 55
Naphthenic acid corrosion (NAC) is most severe in what phase of flow?

Answer: B

Explanation:
API RP 571 on Naphthenic Acid Corrosion (NAC) details:
"NAC is most aggressive in two-phase flow where the shear stress is high, such as in elbows, reducers, and at orifices."
"High velocity and turbulence in two-phase flow strip protective layers and accelerate corrosion." Therefore, option A is the correct and most critical phase.


NEW QUESTION # 56
_________ of the amine system is the most effective way to prevent amine corrosion.

Answer: A


NEW QUESTION # 57
Sulfidation of iron-based alloys usually:

Answer: D

Explanation:
API RP 571 and RP 939-C define sulfidation conditions as:
"Sulfidation of iron-based alloys generally becomes significant at temperatures above 500°F (260°C) in hydrocarbon streams with sulfur but without hydrogen."
"For hydrogen-containing environments, this threshold may be reduced to 450°F (230°C)." (Reference: API RP 571, Section 4.2.1.1 - Sulfidation; API RP 939-C, Section 3.1) Therefore, the correct answer is D.


NEW QUESTION # 58
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